@NotNull
private static Modality getMinimalModality(
@NotNull Collection<CallableMemberDescriptor> descriptors) {
Modality modality = Modality.ABSTRACT;
for (CallableMemberDescriptor descriptor : descriptors) {
if (descriptor.getModality().compareTo(modality) < 0) {
modality = descriptor.getModality();
}
}
return modality;
}
@NotNull
private static Modality determineModality(
@NotNull Collection<CallableMemberDescriptor> descriptors) {
// Optimization: avoid creating hash sets in frequent cases when modality can be computed
// trivially
boolean hasOpen = false;
boolean hasAbstract = false;
for (CallableMemberDescriptor descriptor : descriptors) {
switch (descriptor.getModality()) {
case FINAL:
return Modality.FINAL;
case SEALED:
throw new IllegalStateException("Member cannot have SEALED modality: " + descriptor);
case OPEN:
hasOpen = true;
break;
case ABSTRACT:
hasAbstract = true;
break;
}
}
if (hasOpen && !hasAbstract) return Modality.OPEN;
if (!hasOpen && hasAbstract) return Modality.ABSTRACT;
Set<CallableMemberDescriptor> allOverriddenDeclarations =
new HashSet<CallableMemberDescriptor>();
for (CallableMemberDescriptor descriptor : descriptors) {
allOverriddenDeclarations.addAll(getOverriddenDeclarations(descriptor));
}
return getMinimalModality(filterOutOverridden(allOverriddenDeclarations));
}
@Nullable
private static Visibility computeVisibilityToInherit(
@NotNull CallableMemberDescriptor memberDescriptor) {
Collection<? extends CallableMemberDescriptor> overriddenDescriptors =
memberDescriptor.getOverriddenDescriptors();
Visibility maxVisibility = findMaxVisibility(overriddenDescriptors);
if (maxVisibility == null) {
return null;
}
if (memberDescriptor.getKind() == CallableMemberDescriptor.Kind.FAKE_OVERRIDE) {
for (CallableMemberDescriptor overridden : overriddenDescriptors) {
// An implementation (a non-abstract overridden member) of a fake override should have the
// maximum possible visibility
if (overridden.getModality() != Modality.ABSTRACT
&& !overridden.getVisibility().equals(maxVisibility)) {
return null;
}
}
return maxVisibility;
}
return maxVisibility.normalize();
}